import * as websocket from 'websocket';
import * as redis from 'redis';
import * as CRC32 from 'crc-32';
import OthelloGame, { pack } from '../models/othello-game';
import { publishOthelloGameStream } from '../event';
import Othello from '../../common/othello/core';
import * as maps from '../../common/othello/maps';

export default function(request: websocket.request, connection: websocket.connection, subscriber: redis.RedisClient, user?: any): void {
	const gameId = request.resourceURL.query.game;

	// Subscribe game stream
	subscriber.subscribe(`misskey:othello-game-stream:${gameId}`);
	subscriber.on('message', (_, data) => {
		connection.send(data);
	});

	connection.on('message', async (data) => {
		const msg = JSON.parse(data.utf8Data);

		switch (msg.type) {
			case 'accept':
				accept(true);
				break;

			case 'cancel-accept':
				accept(false);
				break;

			case 'update-settings':
				if (msg.settings == null) return;
				updateSettings(msg.settings);
				break;

			case 'init-form':
				if (msg.body == null) return;
				initForm(msg.body);
				break;

			case 'update-form':
				if (msg.id == null || msg.value === undefined) return;
				updateForm(msg.id, msg.value);
				break;

			case 'message':
				if (msg.body == null) return;
				message(msg.body);
				break;

			case 'set':
				if (msg.pos == null) return;
				set(msg.pos);
				break;

			case 'check':
				if (msg.crc32 == null) return;
				check(msg.crc32);
				break;
		}
	});

	async function updateSettings(settings) {
		const game = await OthelloGame.findOne({ _id: gameId });

		if (game.isStarted) return;
		if (!game.user1Id.equals(user._id) && !game.user2Id.equals(user._id)) return;
		if (game.user1Id.equals(user._id) && game.user1Accepted) return;
		if (game.user2Id.equals(user._id) && game.user2Accepted) return;

		await OthelloGame.update({ _id: gameId }, {
			$set: {
				settings
			}
		});

		publishOthelloGameStream(gameId, 'update-settings', settings);
	}

	async function initForm(form) {
		const game = await OthelloGame.findOne({ _id: gameId });

		if (game.isStarted) return;
		if (!game.user1Id.equals(user._id) && !game.user2Id.equals(user._id)) return;

		const set = game.user1Id.equals(user._id) ? {
			form1: form
		} : {
			form2: form
		};

		await OthelloGame.update({ _id: gameId }, {
			$set: set
		});

		publishOthelloGameStream(gameId, 'init-form', {
			userId: user._id,
			form
		});
	}

	async function updateForm(id, value) {
		const game = await OthelloGame.findOne({ _id: gameId });

		if (game.isStarted) return;
		if (!game.user1Id.equals(user._id) && !game.user2Id.equals(user._id)) return;

		const form = game.user1Id.equals(user._id) ? game.form2 : game.form1;

		const item = form.find(i => i.id == id);

		if (item == null) return;

		item.value = value;

		const set = game.user1Id.equals(user._id) ? {
			form2: form
		} : {
			form1: form
		};

		await OthelloGame.update({ _id: gameId }, {
			$set: set
		});

		publishOthelloGameStream(gameId, 'update-form', {
			userId: user._id,
			id,
			value
		});
	}

	async function message(message) {
		message.id = Math.random();
		publishOthelloGameStream(gameId, 'message', {
			userId: user._id,
			message
		});
	}

	async function accept(accept: boolean) {
		const game = await OthelloGame.findOne({ _id: gameId });

		if (game.isStarted) return;

		let bothAccepted = false;

		if (game.user1Id.equals(user._id)) {
			await OthelloGame.update({ _id: gameId }, {
				$set: {
					user1Accepted: accept
				}
			});

			publishOthelloGameStream(gameId, 'change-accepts', {
				user1: accept,
				user2: game.user2Accepted
			});

			if (accept && game.user2Accepted) bothAccepted = true;
		} else if (game.user2Id.equals(user._id)) {
			await OthelloGame.update({ _id: gameId }, {
				$set: {
					user2Accepted: accept
				}
			});

			publishOthelloGameStream(gameId, 'change-accepts', {
				user1: game.user1Accepted,
				user2: accept
			});

			if (accept && game.user1Accepted) bothAccepted = true;
		} else {
			return;
		}

		if (bothAccepted) {
			// 3秒後、まだacceptされていたらゲーム開始
			setTimeout(async () => {
				const freshGame = await OthelloGame.findOne({ _id: gameId });
				if (freshGame == null || freshGame.isStarted || freshGame.isEnded) return;
				if (!freshGame.user1Accepted || !freshGame.user2Accepted) return;

				let bw: number;
				if (freshGame.settings.bw == 'random') {
					bw = Math.random() > 0.5 ? 1 : 2;
				} else {
					bw = freshGame.settings.bw as number;
				}

				function getRandomMap() {
					const mapCount = Object.entries(maps).length;
					const rnd = Math.floor(Math.random() * mapCount);
					return Object.entries(maps).find((x, i) => i == rnd)[1].data;
				}

				const map = freshGame.settings.map != null ? freshGame.settings.map : getRandomMap();

				await OthelloGame.update({ _id: gameId }, {
					$set: {
						startedAt: new Date(),
						isStarted: true,
						black: bw,
						'settings.map': map
					}
				});

				//#region 盤面に最初から石がないなどして始まった瞬間に勝敗が決定する場合があるのでその処理
				const o = new Othello(map, {
					isLlotheo: freshGame.settings.isLlotheo,
					canPutEverywhere: freshGame.settings.canPutEverywhere,
					loopedBoard: freshGame.settings.loopedBoard
				});

				if (o.isEnded) {
					let winner;
					if (o.winner === true) {
						winner = freshGame.black == 1 ? freshGame.user1Id : freshGame.user2Id;
					} else if (o.winner === false) {
						winner = freshGame.black == 1 ? freshGame.user2Id : freshGame.user1Id;
					} else {
						winner = null;
					}

					await OthelloGame.update({
						_id: gameId
					}, {
						$set: {
							isEnded: true,
							winnerId: winner
						}
					});

					publishOthelloGameStream(gameId, 'ended', {
						winnerId: winner,
						game: await pack(gameId, user)
					});
				}
				//#endregion

				publishOthelloGameStream(gameId, 'started', await pack(gameId, user));
			}, 3000);
		}
	}

	// 石を打つ
	async function set(pos) {
		const game = await OthelloGame.findOne({ _id: gameId });

		if (!game.isStarted) return;
		if (game.isEnded) return;
		if (!game.user1Id.equals(user._id) && !game.user2Id.equals(user._id)) return;

		const o = new Othello(game.settings.map, {
			isLlotheo: game.settings.isLlotheo,
			canPutEverywhere: game.settings.canPutEverywhere,
			loopedBoard: game.settings.loopedBoard
		});

		game.logs.forEach(log => {
			o.put(log.color, log.pos);
		});

		const myColor =
			(game.user1Id.equals(user._id) && game.black == 1) || (game.user2Id.equals(user._id) && game.black == 2)
				? true
				: false;

		if (!o.canPut(myColor, pos)) return;
		o.put(myColor, pos);

		let winner;
		if (o.isEnded) {
			if (o.winner === true) {
				winner = game.black == 1 ? game.user1Id : game.user2Id;
			} else if (o.winner === false) {
				winner = game.black == 1 ? game.user2Id : game.user1Id;
			} else {
				winner = null;
			}
		}

		const log = {
			at: new Date(),
			color: myColor,
			pos
		};

		const crc32 = CRC32.str(game.logs.map(x => x.pos.toString()).join('') + pos.toString());

		await OthelloGame.update({
			_id: gameId
		}, {
			$set: {
				crc32,
				isEnded: o.isEnded,
				winnerId: winner
			},
			$push: {
				logs: log
			}
		});

		publishOthelloGameStream(gameId, 'set', Object.assign(log, {
			next: o.turn
		}));

		if (o.isEnded) {
			publishOthelloGameStream(gameId, 'ended', {
				winnerId: winner,
				game: await pack(gameId, user)
			});
		}
	}

	async function check(crc32) {
		const game = await OthelloGame.findOne({ _id: gameId });

		if (!game.isStarted) return;

		// 互換性のため
		if (game.crc32 == null) return;

		if (crc32 !== game.crc32) {
			connection.send(JSON.stringify({
				type: 'rescue',
				body: await pack(game, user)
			}));
		}
	}
}